Belt abrasive-machine.



D. S. OAKLEY. BELT ABRASIVE MACHINE. urmonron FILED JUNE 1, 1907. RENEWED 11, 10, 1908.

Patented July 6, 1909.

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D. s. OAKLEY. BELT ABRASIVB MACHINE. APPLECATION FILED JUNE *1, 1907. RENEWED APR. 10

, 1908. Patented July 6, 1909.

2 SHEETS-33111 2v DAVID S. OAKLEY, OF PARKERSBURG, WEST VIRGINIA.

BELT ABRASIVE-MAGHINE.

Specification of Letters Patent.

Patented July 6, 1909.

Application filed June 1, 1907, Serial No. 376,771. Renewed April 10, 1908. Serial No. 426,318.

To all whom it may concern:

Be it known that 1, DAVID S. OAKLEY, a citizen of the United States, residing at Parkersburg, in the county of Wood and State of West Virginia, have inve'nteifl new and useful Improvements in Belt Abrasive-Machines, of which the following is a specification.

This invention relates to wood working machines, and more particularly to an endless sander belt whereby articles of various shapes can be quickly and effectively finished.

The invention has for one of its objects to improve and simplify the construction and operation of devices of this character so as to be comparatively easy and inexpensive to manufacture, conveniently adjustable for a large variety of work, and highly satisfactory 1n use.

A further object of the invention is the provision of a horizontal sanding machine having means for automatically maintaining the sander belt taut, and with means for per mitting one of the pulleys to be adjusted to adapt itself to the sander belt in case there is any inaccuracy in the same.

A still further object is the provision of a simple and conveni .nt clamping means for holding a form under the belt for supporting the latter at a point where the articles to be finished are applied. 7

With these objects in View and others, as will appear as the description proceeds, the invention comprises the various novel features of construction and arrangement of parts which will be more fully described hereinafter and set forthwith particularity in the claims appended hereto.

In the accompanying drawings, which illustrate one of the embodiments of the invention, Figure 1 is a side elevation of the machine. Fig. 2 is a plan view thereof with the sander belt removed. Fig. 3 is an end view partly in section. Fig. i is a transverse section on line 4 4, Fig. 2. Figs. 5 and 6 are detail perspective views of parts of the form clamping means. Figs. 7 and. 8 are detail perspective views of the adjusting means for one of the pulleys of the sander belt.

Similar reference characters are employed to designate corresponding parts throughout the several views.

Referring to the drawing, A designates the frame of the machine, which may be of any suitable character and on which is rotatably mounted a shaft 1 journaled in bearings 2 on which are fixed and loose pulleys 3 and 1 for receiving power from a suitable source by means of a belt. Extending forwardly from the frameAis a bracket 5 on which is hingedly connected by the bolt 6 a horizontal beam or arm B of any desired length and preferably of channel iron cross-section, as shown in Figs. 3 and 4, the outer end of the arm being adjustably supported on a floor standard 7. On the bottom side of the beam is a slotted arm 8 that overlaps the standard 7, and'by means of a bolt 9 passing through the slot 10 and screwed into the standard, the beam may be raised or lowered to suit the workman. On the beam B is a pulley frame G extending laterally therefrom that has journal bearings 11 in which rotates a shaft 12 having a pulley 13 for the sander belt 14. The sander belt passes over a driving pulley 15 on the main shaft 1 that extends beyond one end of the frame A, whereby the belt is operated.

The frame O is mounted on a carriage D which, as shown in Fig. 3, is of angle iron form and engages over the top rib 16 of the beam B and behiiul the web 17 of the said beam, there being a sl'ioulder 18 on the carriage that engages the outer edge of the rib 16 and cooperates with the vertical portion of the carriage to hold. the latter slidably in place. On the carriage B is a bracket 19 forming a bearing for a horizontal shaft 20 that has keyed thereto a pinion 21 that meshes with a stationary rack 22 on the un der side of the rib 16 of the beam B. On the shaft 20 is a grooved wheel 28 that carries a flexible element 2 1 to which latter is attached a weight 25. This weight, as shown in Fig. 1, tends to unwind the flexible elen'ient 24-. and rotate the wheel 23 in anti-clockwise direction so that through the pinion 21 co-acting with the rack 22 will cause the carriage to be moved outwardly or to the right, thereby serving to maintain the sander belt 1 1 taut, while at the same time permitting the belt to yield when objects are pressed on the belt for sand-p apering or finishing.

In case the sander belt should be of greater length at one side than at the other, the ulley 13 can be adjusted so that its axis wil be more or less inclined to the axis of the pulley 15 for the purpose of maintaining the belt evenly stretched at both sides. This ad justing of the pulley is accomplished by adjust-ably mounting the frame O on the car: riage 1). According to one embodiment of this feature, the frame (I is pivotally connect l'lO ed to the carriage by means of a bolt 26, Figs. 2 and 3, and on the frame is a hollow cylindrical head 27 which, as shown in Fig. 7, has diametrically arranged slots 28 for receiving an adjusting screw 29, which latter has a threaded engagement in an opening 30 in the block 31 that is loosely mounted in the head 27. This screw is rotatably mounted in an upwardly extending lug 31 on the carriage D and is provided with a grip or hand wheel 32, whereby the screw can be conveniently turned.

In order to clamp the frame O to the carriage and thereby relieve the screw 29 from any undue strain, a clamping screw 33 passes through the plate portion 34 of the frame 0 and screws into the top of the carriage, the said screw 33 having a grip 35. When obj ects are placed on the unsupported part of the belt, the varying pressure on the latter will cause the carriage to move back and forth on the beam B under the ellect of the weight 25. W'ith some work, however, it is desirable to prevent this free movement of the carriage and for this purpose, a clamping screw 36 is employed that passes through the plate portion 34 and carriage D to bind against the web 16 of the beam B, the said screw having a grip or head 37 for convenience .in turning the screw. On the beam is a form clamping device designated generally by E. This comprises a standard 38 that bears against the web 17 of the beam B and is held in place by a bolt 39 that passes through the same and beam, and is provided with a clamping plate 40 that bears against the edges of the horizontally extending ribs of the beam, as clearly shown in Fig. 4. The standard has a longitudinal slot 41 and the beam a horizontal slot 42 for receiving the bolt 39, whereby the standard can be moved either vertically, horizontally or incline to any desired angle. On the upper end of the standard is a plate 43 mounted to tilt on a bolt 44 and which is clamped in adjusted position by a screw 45 passing through an arcuate slot 46 in the standard and screwing into the plate 43, there being a lever or handle 47 on the screw for turning the same. The plate 43 carries a pair of vise-like aws 4S and 49, the latter being adjustably mounted on the supporting member 50. This supporting member is hingedly connected by means of a pintle 51 to the top of the plate 43, and extending downwardly from the member is an arm 52 having a threaded opening 53 for the reception of an adjusting screw 54 that bears at its end against the plate 43, whereby the turning of the screw will throw the member 50, together with the jaws carried thereby, either above or below a horizontal plane. The relatively fixed jaw 49 1 has a base provided with a slot 55 as shown in Fig. 2, through wnich passes a bolt 56 for clamping the aw to the supporting member 50, the said bolt entering a threaded opening 57 of the member 50, as shown in Fig. 5. The movable aw 48 is provided with parallel guide rods 58, Fig. 6, that slidably engage in openings 59, Fig. 5, and swiveled on the jaw 48 is an operating screw 60 that enters a threaded opening 61 in the member 50. On the guide rods 58 are helical compression springs 62 that bear against the movable jaw and member 50 and tend to move the jaw outwardly. The operating screw 60 is provided with a lever 62 for turning the same. The clamping device E is employed to hold forms of any desired shape, one of which is shown in position in Fig. 1 and designated by F. The form is clamped between the jaws 4S and 49 and engages under the top length of the sander belt 14. This form can be adjusted with the standard 38 to any desired position and can. also be adjusted about the horizontal bolt 44 and also about the pintle 51 so that a large variety of work can be finished by the machine.

In practice, the various parts of the machine are set so as to be suitable for any particular kind of work to be done. The beam 1 is adjusted up or down by loosening the screw 9 to permit the arm 8 to slide on the standard 7, and after the desired position is reached, the screw is again tightened. The particular form required for the work is applied to the clamping device E and by means of the screw 54, this form can be adjusted about the pintle 51 and by loosening the screw 45, the form can be adjusted about the belt or axis 44. To raise or lower the form, or to adjust the position of the latter along the beam B, the bolt 39 is loosened, thereby permitting the standard 38 to be moved to the required position, whereupon the bolt is again tightened. When it is desired to operate the machine, the power is thrown on, thereby driving the belt through the wheel 15. The operator takes a position at one end of the frame adjacent the form F and applies the work to the top side of the abrasive belt or sander in the usual manner, and the work is sand papered or finished by properly manipulating the same on the belt. it is to be noted that the portion of the belt between the pulley 13 and form F is unsupported so that it will flex downwardly between these two parts when an object is applied thereto, thereby enabling objects having any variety of gravity to be finished. flexed downwardly, the carriage D is, of course, moved so as to permit the belt to loosen. This movement of the carriage is accomplished against the influence of the counterbalance weight 25. As soon as the pressure is relieved from the belt, the carriage returns to its normal position. If the belt does not run properly over the pulleys, the pulley 13 can be adjusted by first loosening the screw 33 and then operating the W hen the belt is screw 29 so as to change the relation of the shaft 12 with the driving shalt 1. Il. it is desired to operate the machine without permitting the belt to yield under the pressure of the work pressed thereon, the carriage can be tightened by means of the screw 36.

From the foregoing description, taken in connection. with the aceomp anying drawings, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which the invention appertains, and while I have described the principle of operation of the invention, together with the apparatus which I new consider to be the best embodiment thereof, I desire to have it understood that the apparatus shown is merely illustrative and that such changes may be made when desired, as are within the scope of the claims.

Having thus described the invention, what I claim is 1. In a machine of the class described, the combination of a frame, a shaft, a driving pulley mounted thereon, an arm hinged on the frame to swing on an axis parallel with the shaft, adjustable means for supporting the free end of the arm, a carriage slidably mounted on the arm to move longitudinally thereof, a plate bolted to the carriage and adapted to tilt on the said bolt as a center, a screw lor tilting the plate, a shaft mounted on the plate, a pulley 011 the shaft, an abrasive belt passing around both pulleys, means mounted on the carriage and tending to move the same constantly in one direction for tightening the belt, and a device for rigidly securing the carriage to the arm and rendering the said means inoperative.

2. In a machine of the class described, the combination of a supporting structure, a driving shaft mounted thereon, a pulley on the shaft, an arm hingedly mounted on the structure, a horizontally-movable carriage slidable longitudinally on the arm, a horizontally disposed plate secured to the carriage and adapted to tilt thereon, an L-shaped extension on and projecting laterally from the plate, bearings on the plate and extension, a horizontal shaft rotatable in the bearings, a pulley on the shaft, an abrasive belt passing around the pulleys, and a gravity acting means arranged to move the carriage and attached parts in a direction to maintain the belt taut.

In a machine of the class described, the combination of a supporting structure, a driving pulley thereon, a carriage mounted on the structure, a tiltable member on the carriage, hearings on the member, a shaft in the bearings, a pulley on the shaft, a belt passing around the pulleys, a hollow head on the member, a block movably mounted in the head, an adjusting screw rotatably mounted on the carriage and. prevented from longitudinal movement and engaging the said block for moving the latter to tilt the member, a means for clamping the member on the carriage, a means for clamping the carriage on the structure, and a device tending to move the carriage and attached parts for tightening the plate when the second clamping means is released.

4L. In. a machine of the class described, the combination of a supporting structure, a carriage movable thereon, a weight mechanism tending to move the carriage in one direction, a clamping screw for holding the carriage in fixed position on the structure and in opposition to the said mechanism a supporting frame on the carriage, means for adjusting the position of the frame, a pulley mounted on the frame, a driving pulley on the said structure, and an abrasive beltpassing around the pulleys.

5. In a machine oi the class described, the combination of a supporting structure, a form carrying member adjustably mounted thereon, a plate bolted to the member and tiltable on the belt, a clamping screw for holding the plate in position, a second plate hingedly connected with the first, a screw on the second plate for tilting the same, an adjustable jaw carried on the second plate, a second jaw mounted on the plate, and a screw for producing relative movement to the jaws, said jaws being mounted entirely on the second plate.

6. In a machine of the class described, the combination of a supporting structure, a form carrying arm mounted on the structure and provided with an aperture and an arouate slot, a plate, a bolt extending through the aperture and pivotally mounting the plate on the member, a clamping screw in the slot and engaging the plate for frictionally holding the latter on the member, a member hingedly mounted on the plate and having a threaded opening and a smooth opening, a relatively fixed jaw mounted on the plate, a movable jaw, a guide member on the movable jaw engaging the smooth opening on the said member, and a screw swiveled on the movable jaw and engaging in the threaded opening of the member for actuating the jaw.

7. In a machine of the class described, the combination of an abrasive belt, means for driving the same, and a form supporting device comprising a pair of clamping jaws relatively adjustable, an operating screw swiveled in one jaw and screwing into the other jaw, a hingedly mounted member supporting the jaws, and means for adjustably supporting the member.

8. In a machine of the class described, the combination of an abrasive belt, means for driving the same, and a form supporting device comprising a member mounted for ad- I j ustment in two different directions, a plate thereon a )1V0l) lor the Jlate means [or clamping the plate in position, a member hingedly connected with the plate, means for adjusting the said member With respect to the plate, an adjustable jaw on the lastmentioned member, a second jaw movably mounted with respect to the first.

9. In a machine of the class described, a supporting frame, pulleys mounted thereon, an abrasive belt passing around the pulleys, a form supporting device disposed between the pulleys, said device comprising an ad justahle standard, a plate bolted thereto and adapted to tilt thereon, a clamping screw for holding the plate in position, a member hingedly connected. with the plate, a screw carried by the member and bearing against the plate for tilting the member, a relatively stationary aw adjustably mounted on the member, a movable aw guided 011 the member, springs acting on the movable jaw, and an operating screw swiveled on the movable aw and having a threaded engagement with the said member,

10. In a machine of the class described, the combination of a supporting structure, a frame pivotally mounted thereon, a pulley rotatably mounted on the frame and movable therewith, a pulley on the structure, an abrasive belt passing around the pulleys, and means for adjusting the frame, said means comprising a head, a block loosely mounted in the head and having a threaded opening, and an operating screw extending into the head and through the opening and held against longitudinal movement for ad justing the frame.

In testimony whereof, I ailix my signature in presence of two witnesses.

DAVID S. OAKLEY. l Vitnesses NORTON L. UPSON, V. I'IENDERSHOTL. 

